Mostly genetics and temperature fluctuations. Sometimes stress but usually not a deficiency. Did you transplant recently? Is she always outside or back and forth? Temperature can really do some fun things with color.
Haven’t transplant and yes outside all the time .
I think you’re in good shape. Nature is just a fun girl and sometimes paints her toys. It’s just in the genetics of the plant.
What strain? I grew a red poison from sweet seeds and she had dark purple stock and stem.
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